They make mistakes. I've had that happen in the past but it doesn't explain why you can't log on.
Go back to paltalk.com and download a tiny program called regfixer. That should solve the log on problem.
Now for the E~mail problem, what I have had to do is erase the old one after I got logged on and insert another different E~mail to finally get it through.
It's the only solution I know other than going into a Pal Talk help room and talking to one of the Pal Talk admin about it.
Hope this helps.